INDUSTRY 15

Fertilizer Density Meter

15 / AGROCHEMICAL

Urea solution tank-farm density + level, ammonia synthesis, pesticide intermediate reactors and compound fertilizer blending — full agrochemical process monitoring.

3 applicable products 3 application cases
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Overview

Fertilizer and agrochemical is a pillar of Chinese basic industry — urea production alone exceeds 60 million tons annually. Key measurement points include urea solution tank farm level + density, ammonia synthesis loops, pesticide intermediate reactor concentration (methyl chloroformate, pyrethroids, organophosphates) and compound fertilizer blending. Leading Chinese producers (Xinlianxin, Hualu Hengsheng, Yangmei, Luxi, CNOOC Chemicals, Lier Chemical, Yangnong) rely on inline density measurement for production stability and quality control.

Process challenges

  • Urea tanks have tall columns (10-25 m) — production needs simultaneous density + level, not just level
  • Urea readily crystallizes at 60-80°C — diaphragms and intrusive probes scale and clog
  • Ammonia synthesis runs strongly alkaline with NH₃ gas — corrodes common wetted materials
  • Pesticide reactors run batch — every batch needs traceable concentration history
  • Nuclear gauge phase-out is accelerating in fertilizer plants

Recommended solutions

Measurement pointPrincipleModels
Urea solution tank density + levelDP (double flange)PS7300
Ammonia solution concentrationTuning fork + alkali coatingPS7400
Pesticide reactor concentrationSpectroscopic / refractivePS7100 / PS7110
Compound fertilizer blendingUltrasonic sound velocityPS7020
Liquid ammonia storage densityTuning fork + high-pressure ExPS7400
RECOMMENDED PRODUCTS

Products that fit this industry

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PS7020

Inline Ultrasonic Concentration Meter

The PS7020 series inline ultrasonic concentration meter determines concentration from a quantity that can be measured directly: the time an ultrasonic pulse takes to cross the medium. The acoustic path length is fixed by the measuring spool, so the transit time gives the sonic velocity, which is converted to concentration or density through a calibration table established on the actual liquid. The instrument is of integral construction, with no moving parts, no consumables and no radiation source.
PS7021

Inline Ultrasonic Phase Separation Detector

PS7021 decides the phase from sound velocity: time of flight over a fixed path gives the velocity, the amplitude of the same echo gives the scattering, and together they separate heavy phase, rag layer and light phase. Three volt-free relays drive the diverter valve directly. On a pair like dichloromethane and water — a third apart in density yet nearly identical in acoustic impedance — density and impedance instruments cannot tell the phases apart, while the velocities differ by 390 m/s. DN25 / DN32 / DN50 spools, 316L with sapphire windows or PTFE-lined.
PS7100

Spectroscopic concentration meter

The PS7100 series spectral concentration/density meter employs multi-channel full-spectrum technology to deliver real-time, reagent-free, and undiluted high-precision concentration measurements. Based on the Lambert–Beer law, this instrument provides broad coverage across the ultraviolet, visible, and near-infrared spectra, making it suitable for industries such as chemicals, pharmaceuticals, and food & beverage, and particularly well‑suited for concentration monitoring in complex multiphase systems.
APPLICATION CASES

Cases in this industry

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Inline Ultrasonic Phase Separation Detector · PS7021

Solvent / water washing — interface detection on toluene, ethyl acetate and hexane circuits

Interface detection on a multi-product line, where the same drain runs toluene this week and ethyl acetate next. Any discriminator tied to colour, conductivity or density has to be re-validated at every changeover. The page tabulates the velocity gap between water and a dozen common solvents (the closest pair still 155 m/s apart), what temperature and salt do to that gap, where the method stops working, and how recipe-based thresholds handle changeovers.

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Inline Ultrasonic Concentration Meter · PS7020

Inline concentration of 92–98 % sulfuric acid

Inline concentration of circulating acid in drying and absorption towers, diluted acid and product acid: density has a maximum and conductivity an extremum in the concentrated band, while sound velocity is single-valued and steep. The PS7020 measures ±0.05–0.1 wt% at 85–99 % against titration; 35–45 % is the band sound velocity cannot measure; temperature compensation is the constraint, and materials are chosen for the lowest concentration at the highest temperature.

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Inline Ultrasonic Concentration Meter · PS7020

Inline concentration of ammonium nitrate solution

Ammonium nitrate solution in tanks and lines: GB 44022—2024 caps it at 93 % with 8-hourly checks, and 93 % crystallizes near 110 °C. PS7020 up to 120 °C; PS7400 or PS7220 above.

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